络合吸附波测定痕量钼的研究  

Determination of Molybdenum by Adsorptivecomplex Polarographic Wave

作　　者：周长利[1] 高天广[1] 李秀玲[1] 卢燕[1] 刘洪军 

机构地区：[1]山东建材学院应化系

出　　处：《分析科学学报》1999年第2期119-123,共5页Journal of Analytical Science

摘　　要：在ｐＨ４．５０的０．０５ｍｏｌ／ＬＨＡｃ－ＮａＡｃ介质中，研究了钼（Ⅵ）－邻菲络啉的极谱行为。钼（Ⅵ）－邻菲络啉（ｐｈｅｎ）配合物在２．５次微分极谱仪上于－０．５０Ｖ，－０．６７Ｖ处产生两个吸附还原波，后者的峰峰值ｅ″ｐｐ与钼（Ⅵ）浓度在２．０×１０－８～８．０×１０－６ｍｏｌ／Ｌ范围内呈线性关系，检出下限可达５．０×１０－１０ｍｏｌ／Ｌ。研究了配合物组成，极谱波的性质及其机理。应用该法测定豆类食品中的微量钼，选择性好，灵敏度高。The polarographic behavior of Mo()phen system at a drop mercury electrode was investigated in a buffer solution of 0.05mol/L HAcNaAc (pH4.5). The Mo()phen complex produces two reduction peaks at -0.50V,-0.67V(vs.SCE).The peaktopeak epp(Ep=-0.67V) increases linearly with Mo() concentration. Under the optimum conditions, the limit of detection and the linear range of 2.5thorder derivative osillopolargraphic current epp were 5.010-10 mol/L and 2.010-88.010-6 mol/L Mo(),respectively. This method has been applied to the determination of trace Mo() in beans with satisfactory results. Also, the composition of Mo()phen complex and the mechanism of the electrode process have been studied.

关 键 词：邻菲络啉 痕量 钼 测定 络合吸附波 

分 类 号：O614.612[理学—无机化学]